.material {
    display: flex;
    justify-content: center;
}

#head {
    margin-bottom: 20px;
}

#head_span {
    margin: auto;
    font-weight: 500;
}

#head_img1 {
    float: right;
    height: 16px;
}

#head_img2 {
    width: 60px;
}